Does anybody by chance know how the JDM Map sensor compares to the Zeitronix 3.5 MAP sensor? There's no real price difference, I'm only asking to figure out if I can kill two birds with one stone by using either the Zeitronix boost sensor or the JDM sensor for both the ECU boost control, and logging via Zeitronix. It would be convenient to calibrate the sensor reading that way.

 

The zeitronix sensor is pretty darn accurate (+/- 0.1psi)and you can log your zeitronix components thru evoscan too. If you are planning on using the zeitronix setup for your wideband system anyhow, its as simple as it gets to use the boost sensor with it. The zeitronix also helps you to calibrate your map sensor for your altitude simply by clicking a button to set your 0psi mark while the car isn't running.

 

Yes, zeitronix is cool.

But you cant have Psi based boost control with the zeitronix (AEM) MAP sensor

 

Derr, very true...late night brain fart lol. Obviously for logging and monitoring its good.

 

Does anybody have the address for 88580014?

Thanks

 

88580014 is an EDM ROM, and EDM Evos have no accommodation for a MAP sensor. Is it your car that has the 88580014 ROM?

 

yes it does and I have a 3 bar MAP & IAT

 

lol. I followed the instructions for the Evoscan, but I can't seem to get it to work. I got the part where it has the field in the Evoscan, but it doesn't seem to log hte boost...?

I copy and pasted this to the end of the XML file.

<DataListItem DataLog="Y" Color="" Display="MAP" LogReference="MAP" RequestID="38" Eval="0.19347*x-14.31678" Unit="psi" MetricEval="" MetricUnit="" ResponseBytes="1" GaugeMin="-15" GaugeMax="30" ChartMin="-15" ChartMax="30" ScalingFactor="1" Notes=""/>

 

Has anyone had success doing this mod on a 9642007/08 car? Mine is a bastard child.

 

FR, sorry I haven't gotten back to you. Had a new addition to the family on Oct 30. :-) Hoping to have time to deal with this in a few weeks. I do have an idea of what's happening though. It seems that the 9642007/8 do use the MAP sensor in ways not seen in the other ROMs. Just need to figure out the code.

 

Gongrats! I was just curious of the experiences of others. Take your time.

 

I've got a JDM MAP up for sale now if anyone wants it:

https://www.evolutionm.net/forums/sh...d.php?t=306728

 

What rom id do you have? I have a 88840016 rom and I was trying to find if there was a way to make this thing work...

 

Ok, maybe a stupid question here, but...

From a boost standpoint, is the psig or psia important? I'm thinking its the psia. The maximum cylinder pressure that you see is based on how much air and fuel you can cram in there, discounting knock, but basically more air + more fuel = higher peak cylinder pressure.

The amount of air that makes its way into the cylinder is based on the absolute pressure in the manifold (hence the speed density method of fuel metering). The peak cylinder pressure, assuming no knock, should then be related to the boost in psia, not psig.

So assume you drive your car from San Francisco to Denver. You lose about 2 psi of outside pressure. The peak cylinder pressures in an engine run in the 500 psi to over 2000 psi (in diesels) range. The measly 2 psi change in ambient has no effect on the motor. Therefore, if you're controlling boost based on absolute pressure, you shouldn't have to monkey with it at all. You can boost 20 lbs at sea level and 22 lbs at 5000 ft and it looks the same to your engine.

I guess the difference would be quicker spool at higher altitude due to extra dp across the turbine.

Am I completely off my rocker?

 

I've been wondering about this too and I think you are right that psia is the correct parameter to control the boost settings from. Since the engine is spec'ed to operate at a certain peak pressure, you always want to be as close to that value as you can get regardless of ambient conditions. The ECU's ability to adjust timing on the fly should still account for any ambient temperature/density variations to prevent knock while operating at the max cylinder pressure.